Add a helpful warning msg about case sensitivity on isolated scope variable names

I just spent several hours banging my head because of an undefined value with isolating scope. I talked to another engineer who had the same problem and he just gave up after wasting 1/2 a day. I eventually guessed that it might be a case sensitivity issue. I just want to pay it forward and help people from giving up on this!!!!
Yes, a link to the appropriate documentation would be great! I guess it is for both. It is an attribute which is specifying a model variable to use. As long the note mentions there is an easy/common mistake.

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